/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Parameterization/MeshPlanarSymmetry.h
the input Quaternion mirrored across the Symmetry plane
[FQuaterniond](API\Runtime\GeometryCore\FQuaterniond) GetMirroredOrientation ( const [FQuaterniond](API\Runtime\GeometryCore\FQuaterniond) & Orientation ) const